Bring half and half to simmer in heavy medium saucepan.,Whisk sugar, eggs, egg yolk and flour in medium bowl to blend.,Gradually whisk in hot half and half.,Transfer to saucepan.,Whisk over medium heat until mixture thickens and comes to boil, about 5 minutes.,Boil 1 minute.,Pour into medium bowl.,______,Press plastic onto surface of pastry cream.,Cover; chill until cold, about 4 hours.,(Can be made 1 day ahead.,Keep chilled.)